Glad you're enjoying it!
I've made an update with a fix for rewind that should allow your save to load again.
Also updated gadgets so that they can be selected and equipped via the upgrades board.
Thanks for the feedback!
Thanks for the prompt response and update! The issues are gone. I thought I'd have to start over from scratch, haha.
One last minor observation: When you purchase certain upgrades (not sure if it's like this for all of them, I noticed it on the 2nd movement speed upgrade), the buy button is still visible but greyed out and has a cost of -1 credits.